Signors to the barnard



(No Model.)

J. B. CORNWALL & H. A. BARNARD.

SPLIT PULLEY. 4 No. 409,140. Patented Aug. 13, 1889..

Witnesses Ingeators m k W A w fiWwMdL aw MWMW UNITED STATES PATENT OFFICE.

JOHN B. CORN WVALL AND HEMAN A. BARNARD, OF MOLINE, ILLINOIS, AS

SIGNORS TO THE- BARNARD & LEAS MANUFACTURING COMPANY, OF SAME PLACE.

SPLIT PU LLEY.

SPECIFICATION forming part of Letters Patent No. 409,140, dated August 13, 1889. Application filed May 23, 1889. Serial No. 311,831- (No model.)

To aZZ whom it may concern: The letterE indicates a clampi11g-box,pref- Be it known that we, JOHN B. CORNWALL erably made of cast-iron, one of which is bolted and HEMAN A. BARNARD, of Moline, in the to each main arm in position to receive the. county of Rock Island and State of Illinois, ends of the clamp-blocks and retain them in have invented certain new and useful Implace against the pressure or strain that may provements in Split Pulleys; and we do hereby be brought to bear against them. These boxes declare that the following is a full, clear, and present broad surfaces which bear against exact description thereof, reference being had the arms of the pulley and prevent the clampto the accompanyingdrawings, and to the letblocks from indenting the said arms. The

IO ters of reference marked thereon,which form arms of the two parts of the pulley are propart of this specification. vided with apertures near their ends, through This invention relates to certain improvewhich bolts G are passed to hold the two ments in split pulleys. Such pulleys as herehalves of the pulley together. The said arms tofore constructed have been formed with have also apertures near their centers, through I 5 hubs, which are confined to the shafts to which bolts H are passed to clamp the blocks which they are applied by means of keys setagainst the shaft. The clamp-boxes are proting into key-seats in the hub and shaft. vided with perforated lugs I, through which Our invention has for its objects to provide wood screws are inserted into the clampa pulley having no hub, the parts of the pulblocks to hold the same to their seats and 20 ley being clamped upon the shaft by means prevent them from dropping out when the of clamping-blocks secured to the cross-arms parts of the pulley are detached. The ends through which the clamping-bolts by which of the clamp blocks are preferably made the parts of the pulley are secured together square, thus forming an angular bearing in pass. each half of the pulley into which the shaft 25 In the accompanying drawings, Figure 1 sets, when the arms 0 are caused to approach represents a face view of a pulley constructed each other by means of the tighten ing-bolts H. according to our invention. Fig. 2 is an en- The clamping-blocks are preferably conlarged detail View of a portion of one of the structed and placed in their seats so that the cross-bars, showing the clamping-blocks, the pressure shall come endwise to the grain of 30 clamp-box, and the clam ping-bolts in their the wood. They are preferably made of suf- 8o proper relative positions. ficient length, so as to be shortened to fit Referring to the drawings, the letters A and shafts of different diameters. Should they be B indicate the two parts of the pulley, the required to fit an unusually small shaft, howrims of which are composed of segments of ever, wedges of iron or wood may be inserted 3 5 wood glued together or otherwise united, as between them and the clamping-boxes. usual. Although we prefer to employ clamping- 0 indicates two main arms, which are prefboxes, it is evident that a pulley may be conerably made of wood located one in eachhalf structed without the same by forming recesses of the pulley and extending from side to side in the arms for the reception of the clamping- 40 of the same, the ends of the arms being let blocks; or the clamping-blocks may be s0 into the rims near each end of the same. The placed as to have their bearings directly said arms are placed equidistant from the against the inner clamping-bolts without decenter of the completepulley to admit the parting from our invention. clamping-blocks D. These blocks are pref- Having thusdescribed our invention, what 5 erably made of wood, in width and thickness we claim, and'desire to secure by Letters Fat 5 proportioned to the diameter and face of the cut, is- I pulley, and are located between the arms of 1. A pulley constructed in two parts, each the pulley, with one end of each block resting having a main cross-arm, intermediate clampagainst the shaft and the other end against ing-blocks, and bolts whereby the parts of the 50 the arms of the pulley. pulley are held together and the blocks caused Ioo to clamp against the shaft, substantially as specified.

2. The ecnnbination, in a split pulley, of the main erossar1ns extending from side to side of each part, the bolts for clamping" the arms together, the clampi rig-blocks located between the said arms and the elampi n g-bolts, whereby the clamping-blocks may be caused to clamp the shaft, substantiall as specified.

3. The combination, in a split pulley having its parts held together by bolts passing through the cross-arms thereof, of the clampbloeks secured to said arms, the said bloeks being made of suilieient length to admit of slun'tening' to lit shafts of varyin diameters, substantially as and for the purpose specified. 

